The experimentally determined aerodynamic characteristics of the NLAM 78 airfoil section, a natural-laminar airfoil, over the Mach number range 0.6 to 0.85 and angles of incidence from -1 to 4 as well as the Reynolds numbers 8, 16, and 32 million, respectively. The airfoil section was selected as the basic airfoil for the hybrid laminar flow control airfoil study, which is described. The test was executed in the NAL two dimensional transonic wind tunnel with a test section of 0.3 x 1.0 m where measurements of the static pressure on the airfoil surfaces and the wake traverse were made. The test has shown that natural laminar airfoil characteristics are maintained for a flow condition of Mach numbers as high as 0.8 and angles of incidence up to 1 degree, and that the lift to drag ratio for the condition takes very high values of 72 to 85 depending on the Reynolds number. Also, it shows that for the flow condition, the drag divergence Mach number is about 0.82 and drag creep phenomena are rarely observed. Comparisons with the flight data shows quite satisfactory agreement. Also, comparison with some supercritical airfoil with almost the same thickness ratio as the present airfoil confirms the superiority of the aerodynamic characteristics of the NLAM 78 airfoil.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Investigation of a Two-Dimensional Hybrid Laminar Flow Control Airfoil at High Subsonic Flow. Part 1: Aerodynamic Characteristic of a Basic Airfoil NLAM78


    Beteiligte:
    O. Nonaka (Autor:in) / Y. Ishida (Autor:in) / M. Sato (Autor:in) / H. Kanda (Autor:in)

    Erscheinungsdatum :

    1990


    Format / Umfang :

    27 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Aerodynamic coefficients of oscillating airfoil in two-dimensional subsonic flow

    Timman, R. / van de Vooren, A.I. / Greidanus, J.H. | Engineering Index Backfile | 1951


    Laminar-flow airfoil

    Somers, Dan M. | NTRS | 2005


    Subsonic high-lift low-resistance laminar flow airfoil profile for middle part of helicopter blade

    ZHAO HUAN / LIU YANXU / GAO ZHENGHONG et al. | Europäisches Patentamt | 2023

    Freier Zugriff